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    <div class="case1">
      <p>--------------------------case1----------------------------------</p>
      <br />
      <div class="test1">测试</div>
      <div class="test2">测试</div>
      <br />
      <br />
      <br />
      <br />
    </div>
    <div class="case2">
      <p>--------------------------case2----------------------------------</p>
      <br />
      <p class="mulit_line">
        <span style="font-size: 12px"
          >这里是高度为150像素的标签内的多行文字，文字大小为12像素。<br />这里是第二行，用来测试多行的显示效果。</span
        ><i>&nbsp;</i>
      </p>
    </div>
    <div class="case3">
      <p>--------------------------case3----------------------------------</p>
      <span class="out">
        <span class="in1">height:20px;</span>
      </span>
      <span class="out">
        <span class="in2">line-height:20px;</span>
      </span>
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    </div>
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